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DSA_sign(3) OpenSSL DSA_sign(3)
NAME
DSA_sign, DSA_sign_setup, DSA_verify - DSA signatures
SYNOPSIS
#include
int DSA_sign(int type, const unsigned char *dgst, int len,
unsigned char *sigret, unsigned int *siglen, DSA *dsa);
int DSA_sign_setup(DSA *dsa, BN_CTX *ctx, BIGNUM **kinvp,
BIGNUM **rp);
int DSA_verify(int type, const unsigned char *dgst, int len,
unsigned char *sigbuf, int siglen, DSA *dsa);
DESCRIPTION
DSA_sign() computes a digital signature on the len byte
message digest dgst using the private key dsa and places
its ASN.1 DER encoding at sigret. The length of the signa-
ture is places in *siglen. sigret must point to
DSA_size(dsa) bytes of memory.
DSA_sign_setup() may be used to precompute part of the
signing operation in case signature generation is
time-critical. It expects dsa to contain DSA parameters.
It places the precomputed values in newly allocated
BIGNUMs at *kinvp and *rp, after freeing the old ones
unless *kinvp and *rp are NULL. These values may be passed
to DSA_sign() in dsa->kinv and dsa->r. ctx is a pre-allo-
cated BN_CTX or NULL.
DSA_verify() verifies that the signature sigbuf of size
siglen matches a given message digest dgst of size len.
dsa is the signer's public key.
The type parameter is ignored.
The PRNG must be seeded before DSA_sign() (or
DSA_sign_setup()) is called.
RETURN VALUES
DSA_sign() and DSA_sign_setup() return 1 on success, 0 on
error. DSA_verify() returns 1 for a valid signature, 0
for an incorrect signature and -1 on error. The error
codes can be obtained by ERR_get_error(3).
CONFORMING TO
US Federal Information Processing Standard FIPS 186 (Digi-
tal Signature Standard, DSS), ANSI X9.30
SEE ALSO
dsa(3), ERR_get_error(3), rand(3), DSA_do_sign(3)
HISTORY
DSA_sign() and DSA_verify() are available in all versions
of SSLeay. DSA_sign_setup() was added in SSLeay 0.8.
0.9.7c 2002-09-25 DSA_sign(3)
Time taken: 0.37440 seconds
Created with the man page lookup class by Andrew Collington,
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